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5 Generalizable All Variables.
6 Require Import Preamble.
7 Require Import General.
8 Require Import Categories_ch1_3.
9 Require Import Functors_ch1_4.
10 Require Import Isomorphisms_ch1_5.
11 Require Import ProductCategories_ch1_6_1.
12 Require Import InitialTerminal_ch2_2.
13 Require Import Subcategories_ch7_1.
14 Require Import NaturalTransformations_ch7_4.
15 Require Import NaturalIsomorphisms_ch7_5.
16 Require Import Coherence_ch7_8.
17 Require Import BinoidalCategories.
18 Require Import PreMonoidalCategories.
19 Require Import PreMonoidalCenter.
20 Require Import MonoidalCategories_ch7_8.
22 (* A Freyd Category is... *)
25 (* a cartesian category C *)
26 `(C:CartesianCat(Ob:=Ob)(C:=C1)(bin_obj':=bobj))
28 (* a premonoidal category K with the same objects (its unit object is 1 because the functor is both IIO and strict) *)
29 `(K:PreMonoidalCat(Ob:=Ob)(bin_obj':=bobj)(I:=pmon_I(PreMonoidalCat:=C)))
31 (* an identity-on-objects functor J:C->Z(K) *)
32 := { fc_J : Functor C (Center_is_Monoidal K) (fun x => x)
34 (* which is a monoidal functor *)
35 ; fc_mf_J : MonoidalFunctor C (Center_is_Monoidal K) fc_J
37 (* and strict (meaning the functor's coherence maps are identities) *)
38 ; fc_strict_first : forall a b, #(mf_first(PreMonoidalFunctor:=fc_mf_J) a b) ~~ id _ (* mf_consistent gives us mf_second *)
39 (* ; fc_strict_id : #(mf_i(PreMonoidalFunctor:=fc_mf_J)) ~~ id _*)
45 Coercion fc_mf_J : FreydCategory >-> MonoidalFunctor.
46 Coercion fc_K : FreydCategory >-> PreMonoidalCat.